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学者姓名：张跃飞
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摘要 ：
The particle morphology determined by the sintering process is the director factor affecting the electrochemical performance of Ni-rich NMC cathode materials. To prepare the ideal NMC particles, it is of great significance to understand the morphological changes during sintering process. In this work, the morphology evolution of LiNi0.8Mn0.1Co0.1O2 (NMC811) synthesis at temperature ranging from 300-1080 degrees C were observed by in situ SEM. The uniform mixture of spherical Ni0.8Mn0.1Co0.1(OH)(2) precursor and lithium sources (LiOH) was employed by high temperature solid-state process inside the SEM, which enables us to observe morphology changes in real time. The results show that synthetic reaction of LiNi0.8Mn0.1Co0.1O2 usually includes three processes: the raw materials' dehydration, oxidation, and combination, accompanied by a significant reduction in particle size, which is important reference to control the synthesis temperature. As heating temperature rise, the morphology of mixture also changed from flake to brick-shaped. However, Ni nanoparticle formation is apparent at higher temperature similar to 1000 degrees C, suggesting a structural transformation from a layered to a rock-salt-like structure. Combining the insitu observed changes in size and morphology, and with the premise of ensuring the morphology change from flakes to bricks, reducing the sintering temperature as much as possible to prevent excessive reduction in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
关键词 ：
High temperature imaging High temperature imaging In situ SEM In situ SEM Lithium-ion battery Lithium-ion battery NMC cathode NMC cathode Particle morphology Particle morphology
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| GB/T 7714 | Tang, Liang , Cheng, Xiaopeng , Wu, Rui et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM [J]. | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 : 9-15 . |
| MLA | Tang, Liang et al. "Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM" . | JOURNAL OF ENERGY CHEMISTRY 66 (2022) : 9-15 . |
| APA | Tang, Liang , Cheng, Xiaopeng , Wu, Rui , Cao, Tianci , Lu, Junxia , Zhang, Yuefei et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM . | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 , 9-15 . |
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摘要 ：
本文提出了一种基于扫描电镜(SEM)的原位高温蠕变实验研究方法,并在750℃/800 MPa的蠕变条件下,对一种二代镍基单晶高温合金开展蠕变实验,对其微观组织在恒定载荷条件下的演化行为及失效断裂过程进行了原位观察.实验结果表明:该方法在750℃/800 MPa下可稳定进行蠕变实验研究,对镍基单晶合金测量显示实验结果可靠,单晶主要通过位错滑移机制变形,随着应变量增加,样品颈缩程度加剧,蠕变速率随之增加,裂纹首先从孔洞缺陷内部萌生并沿着垂直于应力轴的方向扩展,蠕变后期样品发生瞬间断裂,断面与{111}滑移面相对应,断口呈解理断裂特征.
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| GB/T 7714 | 赵京浩 , 何文玲 , 唐亮 et al. 一种二代镍基单晶合金750℃原位蠕变行为研究 [J]. | 电子显微学报 , 2021 , 40 (4) : 361-366 . |
| MLA | 赵京浩 et al. "一种二代镍基单晶合金750℃原位蠕变行为研究" . | 电子显微学报 40 . 4 (2021) : 361-366 . |
| APA | 赵京浩 , 何文玲 , 唐亮 , 吕俊霞 , 王晋 , 张跃飞 et al. 一种二代镍基单晶合金750℃原位蠕变行为研究 . | 电子显微学报 , 2021 , 40 (4) , 361-366 . |
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摘要 ：
本文选用镍基模型单晶高温合金Ni-Al-Ru作为研究对象,综合利用SEM原位拉伸技术和EBSD技术,对样品拉伸轴偏离角度可能造成的室温拉伸性能的误差影响进行了分析。作者将实验上获得的屈服强度和抗拉强度归一化到[010]方向上,所得数据和原始数据相差较大,表明拉伸轴偏离[010]方向的角度是合金拉伸性能误差的重要来源。为了使误差<10%,需要将拉伸轴的偏离角度控制在8.8°以内。并且有必要进一步去寻找其它误差来源。
关键词 ：
欧拉角 欧拉角 拉伸性能 拉伸性能 镍基模型单晶高温合金 镍基模型单晶高温合金 EBSD EBSD
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| GB/T 7714 | 史超超 , 张晓娜 , 王崇愚 et al. 拉伸轴偏离角度对镍基模型单晶高温合金室温拉伸性能的误差影响分析 [J]. | 电子显微学报 , 2021 , 40 (05) : 505-509 . |
| MLA | 史超超 et al. "拉伸轴偏离角度对镍基模型单晶高温合金室温拉伸性能的误差影响分析" . | 电子显微学报 40 . 05 (2021) : 505-509 . |
| APA | 史超超 , 张晓娜 , 王崇愚 , 于涛 , 张跃飞 , 李晖 et al. 拉伸轴偏离角度对镍基模型单晶高温合金室温拉伸性能的误差影响分析 . | 电子显微学报 , 2021 , 40 (05) , 505-509 . |
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摘要 ：
本文提出了一种基于扫描电镜(SEM)的原位拉伸EBSD-DIC微观变形研究方法,对Inconel 718合金在原位拉伸变形过程中局部应变分布演化与形貌、晶粒取向、晶界演化的之间的关联性进行了研究,并对比了DIC方法与KAM方法研究局部应变分布的异同.实验结果表明:Inconel 718合金在原位拉伸过程中以滑移及晶粒转动等方式协同变形,在晶界及部分晶粒内出现了应变集中.晶界处应变演化规律DIC方法与KAM方法的结果保持一致,而晶粒内部的应变分布更适合使用DIC方法表征.
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| GB/T 7714 | 高文杰 , 桑利军 , 王晋 et al. 基于扫描电镜原位拉伸EBSD-DIC微观变形研究方法 [J]. | 电子显微学报 , 2021 , 40 (5) : 589-594 . |
| MLA | 高文杰 et al. "基于扫描电镜原位拉伸EBSD-DIC微观变形研究方法" . | 电子显微学报 40 . 5 (2021) : 589-594 . |
| APA | 高文杰 , 桑利军 , 王晋 , 张跃飞 , 张泽 . 基于扫描电镜原位拉伸EBSD-DIC微观变形研究方法 . | 电子显微学报 , 2021 , 40 (5) , 589-594 . |
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摘要 ：
扫描电子显微镜(SEM)真空腔室内原位加热实验,当温度超过700℃以后,受到热电子的影响,导致扫描电子显微镜扫描成像质量下降,具体表现为产生条纹状的亮纹。针对这一问题,开展对扫描电子显微镜二次电子探测系统及二次电子成像的分析与研究,详细论述了高温下干扰扫描电子显微镜二次电子成像质量的影响因素,并设计出扫描电子显微镜的二次电子成像调节以及图像修复系统。该系统可分为热电子检测、扰动数据获取、图像修复等部分,采用电位检测并实时修改亮纹对应位置的亮度,可实现对被热电子干扰的图像进行主动的亮度补偿,从而实现图像修复的目的。实验结果表明,当样品温度达到1 000℃后扫描电镜仍能获得清晰的二次电子图像信息。
关键词 ：
扫描电镜 扫描电镜 二次电子 二次电子 热电子 热电子 图像修复 图像修复
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| GB/T 7714 | 唐亮 , 刘陵恩 , 徐晋勇 et al. 扫描电镜高温成像干扰分析及图像修复方法研究 [J]. | 电子显微学报 , 2021 , 40 (05) : 601-608 . |
| MLA | 唐亮 et al. "扫描电镜高温成像干扰分析及图像修复方法研究" . | 电子显微学报 40 . 05 (2021) : 601-608 . |
| APA | 唐亮 , 刘陵恩 , 徐晋勇 , 张宜旭 , 王永峰 , 张跃飞 et al. 扫描电镜高温成像干扰分析及图像修复方法研究 . | 电子显微学报 , 2021 , 40 (05) , 601-608 . |
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摘要 ：
Ti-6Al-4V合金表面超声振动滚压强化研究
关键词 ：
粗糙度参数 粗糙度参数 显微硬度 显微硬度 残余应力 残余应力 超声振动滚压 超声振动滚压 TI-6AL-4V TI-6AL-4V 微观结构 微观结构
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| GB/T 7714 | 席刚 , 刘元铭 , 张跃飞 et al. Ti-6Al-4V合金表面超声振动滚压强化研究 [J]. | 席刚 , 2021 , 29 (1) : 91-96 . |
| MLA | 席刚 et al. "Ti-6Al-4V合金表面超声振动滚压强化研究" . | 席刚 29 . 1 (2021) : 91-96 . |
| APA | 席刚 , 刘元铭 , 张跃飞 , 刘燕萍 , 材料科学与工艺 . Ti-6Al-4V合金表面超声振动滚压强化研究 . | 席刚 , 2021 , 29 (1) , 91-96 . |
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摘要 ：
采用超声振动滚压加工技术对Ti-6Al-4V合金表面进行处理,探究该项技术对Ti-6Al-4V合金表面质量的影响。通过对该工艺加工前后的Ti-6Al-4V合金进行表面粗糙度参数、XRD图谱、截面微观形貌、表层残余应力及显微硬度的对比分析,结果表明:经该工艺处理后的合金表面各项粗糙度参数皆有明显降低;加工后的合金表面XRD图谱的衍射峰减弱且宽化,衍射角向高角度方向偏移;加工后的合金表层β相组织相较加工前明显细化,且随着深度增加β相组织逐渐增大;在距离表面约50μm位置的残余应力值最大可达到-967 MPa;加工后的合金表面显微硬度可达到421HV,且在0～140μm的深度范围内,显微硬度随着深度...
关键词 ：
粗糙度参数 粗糙度参数 显微硬度 显微硬度 超声振动滚压 超声振动滚压 微观结构 微观结构 残余应力 残余应力 Ti-6Al-4V Ti-6Al-4V
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| GB/T 7714 | 席刚 , 刘元铭 , 张跃飞 et al. Ti-6Al-4V合金表面超声振动滚压强化研究 [J]. | 材料科学与工艺 , 2021 , 29 (01) : 91-96 . |
| MLA | 席刚 et al. "Ti-6Al-4V合金表面超声振动滚压强化研究" . | 材料科学与工艺 29 . 01 (2021) : 91-96 . |
| APA | 席刚 , 刘元铭 , 张跃飞 , 刘燕萍 . Ti-6Al-4V合金表面超声振动滚压强化研究 . | 材料科学与工艺 , 2021 , 29 (01) , 91-96 . |
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摘要 ：
本文基于自主研发的扫描电子显微镜原位高温拉伸平台,测试样品高温疲劳性能.通过控制恒定应力加载,设计拉-拉疲劳实验,实时观察到纳米尺度疲劳微裂纹萌生扩展过程的微观结构演变过程,得到了高分辨、高放大倍数的实时序列SEM图像,成功实现1000℃高温原位疲劳测试,对于研究纳米尺寸结构材料的高温疲劳失效微观机制有重要意义.
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| GB/T 7714 | 周建力 , 任潇一 , 张宜旭 et al. 基于扫描电镜原位高温疲劳测试方法研究 [J]. | 电子显微学报 , 2021 , 40 (3) : 215-220 . |
| MLA | 周建力 et al. "基于扫描电镜原位高温疲劳测试方法研究" . | 电子显微学报 40 . 3 (2021) : 215-220 . |
| APA | 周建力 , 任潇一 , 张宜旭 , 王晋 , 张跃飞 , 张泽 . 基于扫描电镜原位高温疲劳测试方法研究 . | 电子显微学报 , 2021 , 40 (3) , 215-220 . |
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摘要 ：
A high-temperature in-situ tensile stage setup developed by the authors was combined with electron backscatter diffraction (EBSD) to study the microstructural evolution behavior of Ti-6Al-4V alloy produced by laser direct melting deposition (LDMD) at 400 degrees C. This technique provided direct observation of the microstructure evolution and deformation behavior of materials under dynamic tensile loading at operating temperature. The evolution of grain morphology, misorientation angles of grain boundaries, and Schmid factor (SF) were systematically investigated. The results indicated that the grains no longer sustained the initial lamellar morphology and underwent a severe microstructural evolution during plastic deformation. Various grain morphologies were observed at different tensile strain levels. The statistical analysis revealed the reduction of high-angle grain boundaries' (HAGBs) fraction among alpha/alpha grains, with the opposite trend for low-angle grain boundaries (LAGBs). The increased Schmid factor values (SF 11-20 11-20 11-20 slip system exhibited a sharp drop to SF > 0.4 at higher strain levels. Moreover, it was observed that high-SF grains changed their orientations, while low-SF ones split into smaller grains under tensile load. The kernel average misorientation (KAM) maps showed that deformation promoted dislocation motion, generating many LAGBs. The increasing number of LAGBs and slip openings reduced the boundary resistance and provided an easy path to detour the main crack propagation in response to the applied stress, while the LDMD Ti-6Al-4V specimen showed ductile fracture behavior.
关键词 ：
Grain boundaries Grain boundaries High-temperature tensile test High-temperature tensile test In-situ EBSD In-situ EBSD Laser additive manufacturing Laser additive manufacturing Ti-6Al-4V alloy Ti-6Al-4V alloy
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| GB/T 7714 | Ullah, Rafi , Lu, Junxia , Sang, Lijun et al. Investigating the microstructural evolution during deformation of laser additive manufactured Ti-6Al-4V at 400 degrees C using in-situ EBSD [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 823 . |
| MLA | Ullah, Rafi et al. "Investigating the microstructural evolution during deformation of laser additive manufactured Ti-6Al-4V at 400 degrees C using in-situ EBSD" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 823 (2021) . |
| APA | Ullah, Rafi , Lu, Junxia , Sang, Lijun , Rizwan, Muhammad , Zhang, Yuefei , Zhang, Ze . Investigating the microstructural evolution during deformation of laser additive manufactured Ti-6Al-4V at 400 degrees C using in-situ EBSD . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 823 . |
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摘要 ：
We have prepared (Sr1-xMgx)(Sn0.5Ti0.5)O3, (X = 0.00, 0.25, 0.50, 0.75) samples by the solid state reaction method and studied the structural, optical, electrical modulus and the other dielectric properties of the samples with respect to variation in frequencies (1 x 109 to 2 x 109 Hz) using Impedance Analyzer. This study suggests that the XRD patterns of the samples have shown that this possesses cubic perovskite structure in space group Pm-3m and scanning electron microscope was used to analyze the grain size distribution and porosity of the ceramic. The dielectric properties of these materials were strongly dependent upon on concentration X as well as amount of frequencies. The existence of metal oxygen bonds of Sr-Ti-O was verified by Fourier Transform Infra Red (FTIR) spectrum at 540 cm-1. The highest PL intensity of 716.38 that exhibits the green emission (508.5 nm) was obtained for the composition of (Sr0.25Mg0.75)(Sn0.5Ti0.5)O3. AC conductivity slowly decreases with increasing Mg substitution and also the sample (Sr0.25Mg0.75)(Sn0.5Ti0.5)O3 having the lowest (constant) value of conductivity at 1 GHz-2GHz.
关键词 ：
5 5 50 50 Ball milling process Ball milling process Complex impedance Complex impedance Modulus spectroscopy Modulus spectroscopy Optical spectrum Optical spectrum (Sr) (Sn0 (Sr) (Sn0
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| GB/T 7714 | Abbas, Mujahid , Ullah, Rafi , Ullah, Kamran et al. Structural, optical, electrical and dielectric properties of (Sr1-xMgx) (Sn0.5Ti0.5)O-3 (X=0.00, 0.25, 0.50, 0.75) ceramics via solid state route [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (21) : 30129-30136 . |
| MLA | Abbas, Mujahid et al. "Structural, optical, electrical and dielectric properties of (Sr1-xMgx) (Sn0.5Ti0.5)O-3 (X=0.00, 0.25, 0.50, 0.75) ceramics via solid state route" . | CERAMICS INTERNATIONAL 47 . 21 (2021) : 30129-30136 . |
| APA | Abbas, Mujahid , Ullah, Rafi , Ullah, Kamran , Sultana, Fozia , Mahmood, Aamir , Mateen, Abdul et al. Structural, optical, electrical and dielectric properties of (Sr1-xMgx) (Sn0.5Ti0.5)O-3 (X=0.00, 0.25, 0.50, 0.75) ceramics via solid state route . | CERAMICS INTERNATIONAL , 2021 , 47 (21) , 30129-30136 . |
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